Do a search ,there are several makers of winchester type safeties for the Brno/CZ. Wisner did but not any more. I have both a 602 and a 550 and they work in reverse of each other. I really don't have any problems with either one. I also have a 1939 Mdl70 and the safety is backward and on the other side from the one on my SS mdl 70. Don't have a real problem with them either. It might be nicer if they were all in the same place and worked the same, but such is not the case.